Best ivy for an open curriculum and liberal arts curriculum.
Also, which one has the smallest student body?
princeton or brown for sure are the best for liberal arts
some other good non- ivy leagues for liberal arts are http://colleges.usnews.rankingsandreviews.com/best-colleges/rankings/national-liberal-arts-colleges
Dartmouth has both smallest undergrad (4300) and total enrollment (6100).
The only one with an open curriculum is Brown. A liberal at any Ivy League school will never be at a loss for peers.
Any of the schools can provide an outstanding liberal arts education but Brown is the only one with an an open curriculum.